Why is it a problem? Rice is the staple diet of the Bhutanese people. Weeds are one of the constraints to rice production. In a weed survey conducted in the rice growing areas of western Bhutan, at least 19 different species were found infesting transplanted rice (Dorji et al., 2013). …
Why is it a problem? Maize is the second most important cereal crop in Bhutan. Weeds in maize are a serious constraint to increased production and accounts for about 50% of the input costs. Maize is often inter-cropped with other crops, making weed management more difficult; whether hand weeding or …
Why is it a problem? Potato is one of the main cash crops in Bhutan. Weeds are a severe constraint in potato production, and require considerable resources to manage. Investigations comparing three weed management treatments across a wide range of locations reported average yields of 6.7, 10.7 and 11.6 MT/ha …
Potamogeton distinctus Crop: Rice Why is it a problem? Potamogeton distinctus, locally called shochum, is one of the most serious weeds in transplanted rice in Bhutan. It is an aquatic plant so grows together with the rice. Yield reductions of up to 37% have been reported, even when farmers …
Parasitic plant: Scurrula parasitica Crop: Citrus Why is it a problem? This parasitic plant can reduce growth and vigour of citrus trees. It is easily managed, and only causes serious problems in neglected orchards. Where and when is it a problem? It occurs in all citrus growing areas from …
